Volume 37, Number 3, June 2019
|Page(s)||449 - 456|
|Published online||20 September 2019|
Research on Skin-Friction Drag Reduction by Hydrogen Injection in Supersonic Boundary Layer
Science and Technology on Combustion, Internal Flow and Thermo-Structure Laboratory, Northwestern Polytechnical University, Xi’an, 710072, China
In order to investigate the applicability of the skin-friction reduction technique using hydrogen injecting into turbulent boundary layer, three-dimensional numerical simulation was carried out for a constant-cross-confined-space with rearward facing steps. The flow characteristics near wall surface and development of wall shear stress were analyzed and compared under different coming flow and injection conditions. The simulation results show that the hydrogen injection can achieve around 13.5% skin-friction drag reduction under the coming flow Mach number of 2.3Ma or 2.8Ma. At 2.8Ma, the optimal reduction profit is 13.5% which is obtained when the equivalent ratio is 0.06. The gases mixings are gradually enhanced along the flow path. At the positions of shock wave-boundary-layer interactions, the mixings are first strengthened and then suppressed, and meanwhile, the wall shear stress and density changes with similar law that first decreases and then rebounds at the positions. The declines of skin-friction drag decrease along the flow direction, the best reduction area can profit nearly 60%.
Key words: supersonic punching channel / near wall flow / hydrogen injection / skin-friction drag / skin-friction reduction / three-dimensional numerical simulation / turbulent boundary layer
关键字 : 超声速流道 / 近壁区流动 / 氢气喷注 / 摩擦阻力 / 减阻
© 2019 Journal of Northwestern Polytechnical University. All rights reserved.
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